oracle|預存程序
1.返回數組 (作者:enhydraboy(亂舞的浮塵) )
在oracle後台建立一個程式包或者預存程序
connect scott/tiger;
CREATE OR REPLACE PACKAGE ado_callpkg AS
TYPE eid IS TABLE of NUMBER(4) INDEX BY BINARY_INTEGER;
TYPE ename IS TABLE of VARCHAR2(40) INDEX BY BINARY_INTEGER;
PROCEDURE getEmpNames (empid OUT eid,empname OUT ename);
end ado_callpkg;
CREATE OR REPLACE PACKAGE BODY ado_callpkg AS
PROCEDURE getEmpNames (empid OUT eid,empname OUT ename) IS
CURSOR c1 IS select employee_id,first_name||','||Middle_Initial||','||last_name as name from employee;
cnt NUMBER DEFAULT 1;
c c1%ROWTYPE;
BEGIN
open c1;
LOOP
FETCH c1 INTO c;
empname(cnt):=c.name;
empid(cnt):=c.employee_id;
EXIT WHEN c1%NOTFOUND; -- process the data
cnt :=cnt+1;
END LOOP;
close c1;
END;
end ado_callpkg;
2 前台vb程式調用
Dim cn As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim cmd As New ADODB.Command
Dim str As String
str = "{call ado_callpkg.getEmpNames({resultset 100,empid,empname})}"
cn.Open "Provider=MSDAORA.1;Password=tiger;User ID=scott;Data Source=ORACLE;Persist Security Info=True"
With cmd
.CommandText = str
.ActiveConnection = cn
.CommandType = adCmdText
End With
rs.CursorLocation = adUseClient
rs.Open cmd
Do While Not rs.EOF
Debug.Print rs.Fields(0).Value & vbTab & rs.Fields(1).Value
rs.MoveNext
Loop
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總結
1 oracle的後台預存程序，應該通過一個類似數組並且帶有數字索引的變數返回，有多少個列，就有對應多少個變數
2 前台，調用的sql語句寫法要注意，
{call <package_name>.<prodecure name>(<input1>,<input2>,....<inputn>,{resultset <number>,<output1>,<output2>,...<outputn>})}
注意的細節，
(1) <number>要自己指定一個數字，表示接受的行數大小，如果太小，而實際返回的記錄大於這個數字，會出錯
(2) 如果有輸入參數，應該在command中建立輸入參數,對應的地方用?替代，如
{call ado_callpkg.getEmpNames(?,{resultset 100,empid,empname})}
(3) output和你儲存函數的定義一致，參數名要一樣，次序也一樣，否則也會出錯。
